Information and measurement in generally covariant quantum theory

Details Information and measurement in generally covariant quantum theory Information and measurement in generally covariant quantum theory

2007-01-28

arxiv.org/abs/quant-ph/0701200v3

Physics

Quantum Physics

4 pages, 2 figures, reference added, typos corrected, discussion added, PACS numbers added

Scientific paper

Due to the absence of an external, classical time variable, the probabilistic predictions of covariant quantum theory are ambiguous when multiple measurements are considered. Here, we introduce an information theoretic framework to the covariant formalism, and use it to interpret the measurement process. We find that the time ordering of measurements emerges as an entropy relationship in the state of the observers, giving unique probabilities for multiple measurements. This approach suggests a new, fully self-contained probability interpretation for generally covariant quantum physics, which makes use of a quantum mechanical description of the observer, in contrast to standard quantum mechanics which assumes an external, classical observer.

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